We have two electric dipoles. Each dipole consists of two equal and opposite point charges at the ends of an insulating rod of length d. The dipoles sit along the x-axis a distance r apart, oriented as shown in figure. Their separation r >> d. The dipole on the left:

will feel a force to the left

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will feel a force to the right

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will feel a torque trying to make it rotate counterclockwise

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will feel no torque

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Solution

The correct options are
C will feel no torque
D will feel a force to the left
According to question
$E_{1}$ and $E_{2}$ are the electric fields due to dipole (1) so $E_{1} > E_{2}$
Force on dipole (2): $q E_{1} (l e f t) + q E_{2} (r i g h t) = q (E_{1} - E_{2}) l e f t$ .
Dipole (2) will not experience any torque, because lines of action of both forces are same.

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